A heat exchange method suitable for short well spacing in dry hot rock

Abstract

A method for heat exchange with short well spacing of hot dry rock, comprising the following steps: injecting fracturing fluid into the hot dry rock reservoir from an injection well, and waiting for the high pressure fracturing fluid to extrude the dry hot rock reservoir to a larger size. After the main fracture, a temporary plugging agent is added, which will block the main fracture and extrude more fractures in other directions. The width of the bottom hole crack, and then calculate the time required for heat exchange, and calculate the required quantity and size of the temporary plugging agent based on the data; The heat exchange medium cannot flow, and the heat exchange medium stays in the high-temperature rock formation and is heated until it reaches the design temperature. After the temporary plugging material dissolves, the high-pressure fluid enters the power generation system to complete the power generation operation. While shortening the well spacing, the invention also improves the power generation efficiency, reduces the production cost, and avoids land occupation and waste.

Description

technical field [0001] The invention relates to a short-well-spacing heat exchange method, in particular to a short-well-spacing heat exchange method suitable for dry-hot rock power generation projects, and belongs to the technical field of dry-hot-rock thermal energy utilization. Background technique [0002] In recent years, with the development of industry, the demand for energy is also increasing, and hot dry rock is a new energy source in green new energy; hot dry rock has the advantages of wide distribution, large resource potential, and high economic value. Moreover, hot dry rock is a clean and environmentally friendly energy source, which can be used in various industries such as power generation, heating, and breeding. While alleviating my country's energy crisis to a certain extent, it can also bring certain economic and social benefits to the location of the hot dry rock development site; At present, the mainstream development method of high-quality hot dry rock res...

AI Technical Summary

Problems solved by technology

However, this method will make the distance between the injection well and the production well on the surface far away, resulting in unnecessary land occupation and maintenance and construction costs in the later stage, which is also not conducive to large-scale mining and power generation, and the production cost will be greatly increased.

Although designing injection wells and production wells as directional wells can solve the problem of large surface wellheads, the drilling cost of directional wells is often several times that of vertical wells and the operation is extremely difficult

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